[Catalyst] Generate dynamic list

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 Sorry for interruption.My requirement is:
I have two drop list A and B and two tables A and B in my dababase.
When the page vistited,A shows the option from select name from A,this is
easy to implement.Then I select a option from A,such as 1,at the same
time,It will dynamic generate the B list from select name from B where id =
=3D
1.
I know it could  implement by in javascript.But is there some package in
Catalyst can implement this requirement?
Thanks for your response.
With Best wishes.
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